Battery shunt removal.

[S-M]

Any downsides to removing the negative shunt so the starter battery is getting a good charge every time?

I replaced my starter battery with a new Bosch one a few weeks ago thinking the old one was knackered (Tayna replacement) but its still sitting at around 11.8/11.9 when i goto start it after parking for a week (ive tweeked the battery coding)
The van gives it 14v+ when coasting as normal.

 

[rod_vw]

@S-M as far as I am aware the battery monitor is there to ensure a 20% (ish) overhead in the battery to improve efficiency thus emissions, it also provides for some regenerative braking hence you see the voltage go up to 14v plus on the over-run and some times braking.
I can't see any good reason to remove the shunt though.

The most likely reason for your battery to seem down on volts after being parked is the same as we all have, the small but noticeable current drawn by the various modules that 'wake up' every time you open a door etc.
Many of us with leisure batteries have fitted one of the devices to keep the starter battery topped up from the leisure to solve this very problem, an Ablemail AMT12-12-5 for instance.

 

[S-M]

i use a dcds20 solar b2b setup that apparently has a starter battery maintence/trickle function although trying to find out exactly what/how it works is not going well.

I have seen functions in VCDS for "Energy management" or similar, are these related?

 

[rod_vw]

The VCDS Energy management functions have nothing to do with any leisure or auxiliary battery charging device.

I don't have any knowledge of the DCDS20 Solar B2B that you have but by what I see on-line it is almost plug & play. I found a manual at POWERTECH DCDC-20A DC to DC Dual Battery Charger User Manual if you don't have it already.

 

[Raul a/3]

i use a dcds20 solar b2b setup that apparently has a starter battery maintence/trickle function although trying to find out exactly what/how it works is not going well.

I have seen functions in VCDS for "Energy management" or similar, are these related?

Can you post a link to that model?

 

[S-M]

Can you post a link to that model?

Hi, they are all over the internet, i bought mine from aliexpress but they are available elsewhere.

 

[Raul a/3]

The reason I asked is, to see if it has the function for trickle charging a starter battery.
That kind of stuff I do not touch, either a dedicated low power victron DC/DC converter or a battery master, to keep the starter battery toped up.
I'm very fussy with equipment, as I want it to be reliable, so I tend to buy top tier.

 

[S-M]

some of the websites state it has battery starter maintence once the leisure battery is charged and some dont have this information so its been hard to determine.

 

[Raul a/3]

You will have to run some tests to see if the starter gets anything from habitation, when habitation is charged. If there is no obvious wire set up for this, nor any settings to be set for reverse charging ( by directional), my guess is, it doesn't. Even the Orion XS1400 does not have reverse charging.
But test first, then if it doesn't, I recommend van bizz battery master or Abelmail.

 

[rod_vw]

some of the websites state it has battery starter maintence once the leisure battery is charged and some dont have this information so its been hard to determine.

That's why I linked you to the manual as I couldn't see more than a vague reference to starter battery maintenance. I use an Ablemail 12-12-5 which seems to work well in the real world.

 

[Raul a/3]

I use a victron 24/12-9 switched dc converter. My hab is 24v and starter is 12v. The feed to the DC converter is from the auxiliary pin from multiplus. A max 4A @24v converted to 12v.
The output is adjustable and set to 12.7v. The switch can be linked to a life signal to cut out when the engine runs. I just left it on for now, as starter gets to 12.7v, there is no more current flow.